922 



LIGHT AND LIFE 



from thiosulfate by Chromatium cells: 

 570 

 Photoreceptor in Avena, nature of: 648 

 Photosensitized transformations, chloro- 

 phyll: 329 

 Photo-spin signals in purple bacteria: 



345 

 Photosynthesis: action spectra for 

 chlorella, 461; action spectra, partici- 

 pation of accessory pigments, 455; ac- 

 tion spectra at saturating light in- 

 tensity, 463; action spectrum of, 399; 

 and I)iochemical evolution, 555; Botry- 

 diopsis alpina, action spectra, 462; 

 cell-free and energy conversion process, 

 489; by Chlorella, action spectrum for, 

 465; (iilTcrence spectra in, 400; driven 

 by two light reactions, 407; effect of 

 various agents on 700 mix shift in, 410; 

 energy transfer in, 397; ESR studies 

 of, 363; intensity curve for, 464; light 

 and pigments, 447; mechanism of 

 bacterial, 587; in Porphyridium cruen- 

 hini. c|uantum yield, 475; sensitization 

 of, 398; separation of light and dark 

 phases, 549; spectral changes in, 397; 

 variation of course with wavelengths, 

 466 

 Photosynthetic bacteria: cytochrome 

 pigments in, 436; schematic represen- 

 tation of postidatcd electron transport 

 chains, 442 

 Piiotosynthetic pigments in plants: 448 

 Pliotosynthctic phosphorylation: 498, 

 603; catalysts of, 505; continuous 

 measurement of, 601; electron (low 

 mechanism of, 508; as a function of 

 wavelength. 413; vs. light intensity, 

 412; and molecular oxygen, 501; oxi- 

 dative, 620 

 Photosynthetic pyridine nucleotide re- 

 ductase: 499, 637; absorption spec- 

 trum of, 640; relation to mctha-globin- 

 reducing factor, 640; photoinactiva- 

 lion, 639; effect of on photosynthetic 

 phosphoryl, 638; physical properties, 

 639 

 I'hotosynthetic rcductant formation: 593 



Photosynthetic structure, lipid function 

 in: 392 



Photosynthetic systems, electron spin 

 resonance studies: 356 



Phototropic curvature, mechanism of: 

 665 



Phototropism: 646; in Avena, different 

 types, 656; and light-growth reactions, 

 663; in Phycomyces, 660 



Phthalocyanine as a model for chloro- 

 phyll energy transfer; 332 



Phthalocyanine, structural formula: 333 



Phycobilin: 476 



Phycocyanin: 455 



Phycoerythrin: 455 



Phycomyces, phototropism in: 660 



Phycomyces sporangiophores: action 

 spectrum for positive curvature of, 

 662; light growth reactions of, 664 



Physical models and living organisms: 3 



Phytolacca americana: 492 



Polarization: 52; of emitted fluorescence, 

 88; of indole, 93; and fluorescence 

 lifetime, 98 



Polarization spectra: of bovine serum 

 albumin, 101; of indole, N-methyl in- 

 dole and tryptophan, 89; of human 

 serum albumin, 101; of insulin, ribo- 

 nuclease, tyrosine and zein, 96; of lac- 

 tic dehydrogenase, 100; of lysozyme, 

 100; of N-glycyl tryptophan, 91; of 

 ovalbumin, 98; of tyrosine and cresol, 

 88 



Porphin: 326 



Porphyra lacineata: 401, 479 



Porphyridium cruentum: 379, 479; ab- 

 sorption spectra of, 454 

 Porphyropsin: 725; absorption spectra 

 of, 743 



Potential energy siufaces in indole: 90 

 Protein fluorescence, and transfer of ex- 

 citation energy: 122 

 Proteins, excitation states of: 82, 95 

 Protochlorophyll: bacteriochlorophyll 

 and chlorophyll, relation between, 

 318: structural formula, 319 

 Pterygoleulhis: 756 

 Purine: 58 



